Flexible piezoresistive interfacial shear and normal force sensor and sensor array

a technology of piezoresistive interfacial shear and normal force, which is applied in the direction of force/torque/work measurement apparatus, instruments, applications, etc., can solve the problems of pressure ulcers associated with diabetic foot, inability to measure the shear force component simultaneously,

Active Publication Date: 2009-11-19
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional force sensors are capable of measuring only the compressive force component of an applied force, and are incapable of measuring the shear force component simultaneously.
Moreover, the pressure points on the foot may cause pressure ulcers associated with diabetic foot.

Method used

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  • Flexible piezoresistive interfacial shear and normal force sensor and sensor array
  • Flexible piezoresistive interfacial shear and normal force sensor and sensor array
  • Flexible piezoresistive interfacial shear and normal force sensor and sensor array

Examples

Experimental program
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example 1

An Array of Force Sensors

[0068]A 16×16 2D array of force sensors was built for pressure mapping applications. A zero-potential scanning method was used to address individual elements that were on the intersections of row and column electrodes, as depicted in FIG. 7.

[0069]A zero-potential scanning method was based on turning off the unspecified row and column electrodes to have current only flow through the specified row to column electrical path, which eliminated cross-talk paths. The row electrodes were turned off with multiplexed switches, and the column electrodes were turned off with virtual ground from the amplifier. Each row-column cross had a piezoresistor connected for scanning. The scanned analog data was amplified, sent to an analog-to-digital (A / D) converter, saved in a microcontroller unit (MCU), and sent to a computer by recommended standard 232 (RS-232) or universal serial bus (USB). Software processed the data to show the pressure-mapping image of shear and normal for...

example 2

Shadow Masking Technique

[0071]A shadow mask was made by wet etching of a stainless steel film with a thickness of 50 μm and a line width of 100 μm. A thin layer of PDMS film was made by coating the Dow Corning Sylgard 184 PDMS pre-polymer and its curing agent mixture on a glass substrate, and then curing at an elevated temperature of 70° C. in a convection oven. The cured PDMS film was subsequently covered with the shadow mask for sputtering with a thin layer of gold around 20 nm. A pair of piezoresistors was patterned on a piece of PDMS film, as depicted in FIG. 9A, where a 20-cent Hong Kong coin was used as a size reference. Various designs of piezoresistor pairs were deposited on the PDMS film, as depicted in FIG. 9B, which shows a 2-D force sensor array.

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PUM

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Abstract

A force sensor includes a polymeric substrate including a cavity with a tilt plane, at least two metal piezoresistors on the tilt plane, and a contact pad connected to the metal piezoresistors. The tilt plane may include a measured interface of from 15° to 75°.

Description

BACKGROUND[0001]Force sensors, commonly known as transducers, can convert an applied mechanical pressure, acceleration, strain, or other force into an electrical output signal. Piezoresistive sensors are force sensors that use the piezoelectric effect to measure pressure, acceleration, strain, or other force by converting the force input to an electrical output signal. Traditional force sensors are capable of measuring only the compressive force component of an applied force, and are incapable of measuring the shear force component simultaneously.[0002]Diabetes mellitus (DM) is a prevalent disease. In Hong Kong, China, for example, approximately 15% of the population suffers from DM. Of these DM patients, about 5% of them suffer from “diabetic foot” complications. Moreover, the pressure points on the foot may cause pressure ulcers associated with diabetic foot. Shear force is a key factor that may cause pressure ulcers, in addition to the pressure generated by normal force.[0003]Con...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01L1/22H01C17/28
CPCA61B5/1036A61B2562/0247Y10T29/49103G01L1/205G01L1/2293G01L1/18
Inventor CHENG, CHING-HSIANGCHAO, CHEN
Owner THE HONG KONG POLYTECHNIC UNIV
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